Pasadena City College porn professor Hugo Schwyzer admitted Thursday he had sex with students as recently as 2011 and as a result the college issued a statement saying it would open an immediate investigation into his conduct.

Schwyzer, who last semester taught a class titled “Navigating Porn” and invited adult stars James Deen and Jessica Drake to speak to students, made the admission on the Internet.

On Tuesday a woman who identified herself as a former PCC student in a blog post wrote about having sex with Schwyzer in his campus office in 2008. The former student said she knew of at least one other student who also had sex with Schwyzer, who has been dubbed the “Porn Professor”.

On his blog, http://www.hugoschwyzer.net/blog/ Schwyzer said the claim had merit.

“Until recently, I maintained that I had stopped having sex with students enrolled in my classes in 1998,” he wrote. “That is not true; I started sleeping with students again in 2008, well before my psychiatric breakdown of earlier this year.

“I have no intention of naming names or of discussing numbers, save to say that the allegations (the student) makes are true and that I did indeed have sex with more than one adult student. There is no excuse for this behavior, and I do not expect anyone to defend it.”

In a statement issued late Thursday afternoon, PCC officials said the college would “act swiftly to conduct an investigation and hold Mr. Schwyzer accountable for his actions while an employee.”